Gypsum Hardened Product Bubble Size Distribution Control
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Solution Overview
Problem
Existing gypsum hardened products with reduced density for weight reduction often experience a corresponding decrease in strength, and there is a limit to increasing bubble size to mitigate this strength reduction.
Innovation Solution
The solution involves controlling the coefficient of variation of bubble size within a specific range (0.30 to 0.48) in bubble-containing gypsum hardened products, allowing for enhanced strength while maintaining reduced density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If density of gypsum hardened product is reduced by containing bubbles, then weight is reduced, but strength decreases
Solution Approach 1:
The invention changes the parameter of bubble size distribution (coefficient of variation) to resolve the contradiction. By controlling the coefficient of variation of bubble size to be within a specific range (0.30 to 0.48), the patent achieves both weight reduction through bubble containment and strength maintenance, as uniform bubble size distribution prevents stress concentration while maintaining adequate bubble size for weight reduction
2Strength
If bubble size is increased to suppress strength reduction, then strength improves, but ability to increase bubble size is limited
Solution Approach 1:
Instead of simply increasing bubble size, the invention changes the parameter of bubble size distribution uniformity (coefficient of variation). By controlling the coefficient of variation to be within 0.30 to 0.48, the patent achieves strength improvement without being limited by the conventional approach of merely increasing average bubble size, as this parameter control enables optimal bubble size distribution that maximizes strength while maintaining weight reduction benefits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
By controlling the coefficient of variation of bubble size, the strength of gypsum hardened products can be improved even when density is reduced, effectively achieving both weight reduction and strength enhancement.
Implementation Method 1
a step of foaming a liquid composition containing a foaming agent composition containing (A) a surfactant (hereinafter referred to as component (A)) and water to obtain a foam
Data Source
AI summary
Provided are a gypsum hardened product and a method for producing the same, whereby, in bubble-containing gypsum hardened products of the same density and the same average bubble size, strength of the gypsum hardened product can be enhanced by controlling a coefficient of variation of bubble size. A gypsum hardened product containing bubbles, wherein a density of the gypsum hardened product is 0.4 g/cm3 or more and 0.8 g/cm3 or less, and in the gypsum hardened product, an average bubble size is 200 µm or more and 600 µm or less, and a coefficient of variation of bubble size is 0.30 or more and 0.48 or less.